Question

When a red flowered pea plant was crossed with a white flowered pea plant, it was found that all plants in the F1 generation carried only red flowers. If these plants are self crossed, i) Find the genotypic ratio that we can expect in F2 generation ii) What is the phenotype and genotype of F1 generation. Draw Punnett square for F2.

Answer 1

Explanation:

ANSWER

RR (Red flower) X rr (White flower) --------------> Rr (F1 generation)

Selfing of F1 :

R r

R RR Rr

r Rr rr

The offspring are: 1 RR - Homozygous Red flowers

2 Rr - Heterozygous Red flowers

1 rr - Homozygous white flowers

Thus the phenotypic ratio is 3 red : 1 white

Answer 2

Answer:

RR (Red flower) X rr (White flower) --------------> Rr (F1 generation)

Selfing of F1 :

R r

R RR Rr

r Rr rr

The offspring are: 1 RR - Homozygous Red flowers

2 Rr - Heterozygous Red flowers

1 rr - Homozygous white flowers

Thus the phenotypic ratio is 3 red : 1 white